cos ^(2) alpha + cos ^(2) (alpha + 120^(...

`cos ^(2) alpha + cos ^(2) (alpha + 120^(@)) + cos ^(2) (alpha - 120^(@))` is equal to

A

`3//2`

B

1

C

`1//2`

D

0

Verified by Experts

The correct Answer is:

A

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